Electric energy consumption in the cotton textile processing stages

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    Specic energy consumption (SEC)

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    gathered from monthly records of the involved plant managements. Estimated electric energyconsumption data is gathered through on-site measurement. Actual and estimated electric energy

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    including 35,000 companies and over 2 million employee. Exportincomes of the sector compose 23.5% of total export income ofTurkish economy in 2006 [5,6]. Total annual production volume ofthe sector is about $30 billion USD [7]. Stable growth of Turkishtextile and clothing sectors have remained over the last two

    the total industrial energy consumption (of rst biggest 500industrial plants) of Turkey is estimated as about 7.2% [11].

    The aim of this paper is to investigate unit electric energyconsumption and its efciency in cotton textile processing stages ofspinning, warpingesizing, weaving, wet processing and clothingmanufacturing. Paper includes general knowledge about Turkishtextile sector, energymanagementprojects conducted inTurkeyandin the world, literature reviews, on-site data collection and analysisof electric energy consumption, characterizing the efciency in

    * Fax: 90 258 296 32 62.

    Contents lists availab

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    Energy 35 (2010) 2945e2952E-mail address: spalamut@pau.edu.trequipments. It is estimated from the report of UNIDO [2] thatelectricity consumption rate in the total consumpted energy forindividual textile production stages are 93% for spinning, 85% forweaving, 43% for wet processing, and 65% for clothingmanufacturing. Rest of the energy that is used in the textile pro-cessing plants is supplied by other energy sources of fuel, naturalgas, and coal [3,4].

    Textile industry is one of the leading industries of Turkey,

    for an ordinary textile good, produced in Turkey. As it is seen fromthe table production cost components of textile products are clas-sied under four groups of raw material-auxiliaries, labor, energy,and nance-transportation.

    Among all the primary production cost components of textilegoods, share of energy cost in textile sector has been reported as6e14% in 1996 [9], 8e10% in 2000 [10], and 5e10% in 2007 [10] intotal production cost. Energy consumption rate of textile sector in1. Introduction

    Textile manufacturing stages areprocesses. Between years of 1971 atextile sector has doubled from 47 EjElectric energy is one of the most cothe textile and clothing plants, usedmachinery, heating and cooling contr0360-5442/$ e see front matter 2010 Elsevier Ltd.doi:10.1016/j.energy.2010.03.029unit textile product of each involved textile processing stages. 2010 Elsevier Ltd. All rights reserved.

    n as energy intensive04 nal energy use in0 Ej/yr in the world [1].ly used energy types inpply energy for textileems, lighting, and ofce

    decades, until elimination of quotas in textile sector for China in2005 [8]. Competition in textile and clothing sector had becomemore severe eventually with the results of global economic crisisin 2008. Turkish textile manufacturers had to face the increasingcosts of textile raw materials, labor, energy, nance and otherrelated expenses.

    In Table 1 share of the production cost components for yarn,woven fabric and clothing manufacturing have been summarizedTurkish textile sector specic electric energy consumption of the plants. It is found that actual electric energy consumptionamount per unit textile product is higher than the estimated electric energy consumption amount perCotton textile productionElectric energy use consumption data and monthly production quantities of the corresponding months are used to facilitateElectric energy consumption in the cott

    S. Palamutcu*

    Textile Engineering Department, Pamukkale University, Engineering Faculty, 20070 Kn

    a r t i c l e i n f o

    Article history:Received 24 July 2009Received in revised form16 March 2010Accepted 17 March 2010Available online 24 April 2010

    Keywords:

    a b s t r a c t

    Electric energy is one of tenergy cost rate is reportmanufactured in Turkey. Sthis paper was to investigareal-time measurements melectric energy was calcuweaving, wet processing

    journal homepage: wwwAll rights reserved.textile processing stages

    enizli, Turkey

    rimary energy sources consumpted in cotton textile processing. Currentbout 8e10% in the total production cost of an ordinary textile productcantly important share of this energy cost is electric energy. The aim ofnit electric energy consumption of cotton textile processing stages usingod. Actual and estimated Specic Energy Consumption (SEC) values ford in the cotton textile processing stages of spinning, warpingesizing,clothing manufacturing. Actual electric energy consumption data are

    le at ScienceDirect

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    evier .com/locate/energy

  • electric energy usage associated with cotton textile processingplants in Industrial Zone of Denizli in Turkey. In particular this paperwill:

    (1) Characterize electric energy usage in existing textile produc-tion plants,

    (2) Quantify the magnitudes of actual and estimated specicelectric energy consumption (SEC) in the dened textile pro-cessing stages,

    (3) To discuss the reason of the gaps between actual and estimatedSEC for electric energy consumption in the cotton textile pro-cessing stages.

    2. Energy management in Turkey

    Energy consumption rate of textile and clothing sector is repor-ted as 5.9% in total energy use of Turkish industrial sectors [11],(annual energy consume of textile and clothing sector is 822,305 toein the total annual energy use volume of 13,923,448 toe in Turkey).

    3. Textile manufacturing processes and energy prole

    Textile manufacturing process is divided into ve main substages of ber processing, spinning, weavingeknitting, wet pro-cessing and garment manufacturing. Fig. 1 shows general produc-tion path line of a typical woven textile product. The dotted boxes 1and 2 in Fig. 1 represent primary and secondary energy consumingapplications in an ordinary textile production plant. The boxeslabeled A, B, and C represent the primary energy consumingproduction lines of spinning, sizing, weaving; wet processing; andgarment manufacturing. Heatingecooling, sanitation, trans-portation, exterior and other energy consuming applications areclassied as secondary energy consuming applications [15].

    Each manufacturing process has its own energy consumptioncharacteristics. Some processes are more energy intensive thanothers. Different types of energy sources are consumed in eachdifferent processing stage, some processes require more electricity

    Table 1Share of production cost components for a textile good, % [10].

    Cost components Yarn Woven fabric Clothing

    Raw material and auxiliaries 55e65 65 55e65Labor 5e8 12e18 20Energy 5e10 5e8 5e8Finance, transportation, etc. 17e35 9e18 17e20

    S. Palamutcu / Energy 35 (2010) 2945e29522946Energy management and saving policies has become subject ofinterest for textile manufacturers as it is for other industrial sectors,right after the 1970s. The world has started to revise its energybudget by utilizing higher efciencies, and to pay attention theurgency of environmental protection. Parallel to emerging concernsabout energy and environment in the world, Turkey had alsoalerted about energy savings and management regulations.Depending on social and economic development of Turkey, totalenergy demand and also electric energy demand are grown rapidly.Reported energy demand increase rate is about 11% for every yearsince 1970s [12]. Alongside the increasing energy demand, energymanagement and energy saving actions had been enhancednationwidely since the beginning of 1980s. It is reported as result ofthe Turkish energy conservation programs that Turkish industrialsectors have an annual energy saving potential of approximately30%. Annual energy saving potential for textile and clothing sectoris reported as 8.36% [13,14] which is substantial potential con-cerning the increasing energy costs in textile processing.Fig. 1. General production path linewhile others requires more heat energy.Spinning process in its various stages (mixing, opening, prepara-

    tion, the spinning operation itself, winding and doubling) consumeselectric energy. Amount of energy consumption in this process isvariable depending on type of spinning system, type of winding anddoubling machines, desired yarn properties and raw material char-acteristics. In case of middle count, carded, ring yarn processing, thespinning and winding processes represent about 80% of energyconsumption per kg of single yarn [16,17]. Sizing process is animportantprocessbetweenspinningandweavingprocesses.Sizingofyarns before warping mostly requires indirect steam that is heatedusing electricity, gas or oil. Weaving processes requires electricalenergy. Amount of energy consumption changes depending on fabricstructure and technical parameters of weaving machine.

    Controlled climatic room condition (25 C temperature, 65%relative humidity) in spinning and weaving rooms is anotherimportant electric energy consuming station in textile processingstages. Seasonal climatic variation is also important parameter forenergy consumption quantity of air conditioning systems.of a woven textile product [15].

  • production capacity (number of unit) energy type

    ated

    energy

    umption

    ,(e)

    Actual

    energy

    consumption

    ,kW

    h(e)

    Deviation

    ,%

    Estimated

    specic

    electricen

    ergy

    consumption

    ,kWh

    (e)/kg

    (wov

    enfabric)

    Actual

    specicelectric

    energy

    consumption

    ,kW

    h(e)/kg

    (wov

    enfabric)

    4211

    8.06

    062

    1.38

    2.24

    9012

    9.11